Homebase: Salzburg, Austria (Unesco-World Heritage Site).
We were on a round-the-world-tour in 2007/08 and on other far travels in 2013/14.
Least travelled places that I have visited: Réunion, Cook Islands (Rarotonga & Aitutaki), British Military Area Cyprus, Trans Dniestr.
Collecting stamps, coins and "foreign countries".